What can a smart-glasses display do that audio cannot?
A display can keep an exact detail available for another glance. A name, time or reference number can be inspected without replaying a spoken answer. That persistence is especially useful when the information is short but easy to mishear.
Some information needs revisiting
We would rather read a booking reference than listen through it repeatedly. With speech, the listener must remember earlier characters while later ones arrive. With text, the whole reference can remain available together. A display also lets the wearer decide when to look, provided the interface does not keep demanding attention.
Take the sample reference "AB7B2." Spoken output may require spelling or repetition to distinguish similar sounds. Text has its own challenges, including similar-looking characters, but it can support a second glance. A fair comparison includes the number of corrections, not just the time taken to deliver the first answer.